llvm dev - Jul 2018 - [MachineScheduler] Skip empty scheduling regions

Hello Dev,

I have a question about empty scheduling region. Currently we compare the
iterators to
see if there is zero or only one schedulable instruction in the current region.
Why don't
we use NumRegionInstrs instead? Consider a scenario: there is only one real
instruction
in the current region but several debug instructions before it.



Thanks,
Yan
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